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. 2020 Jul 16;11:291. doi: 10.1186/s13287-020-01802-8

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — The chest X-ray (A1–A3) of the patient showed that the pulmonary exudative lesions improved after standard treatment and increased before the second cytokine storm. In the patient’s chest CT (B1–B4), we can see the absorption and evolution of pulmonary exudative lesions in patients with COVID-19; comparing February 20 and February 17, the pulmonary exudative lesions have no significant improvement. After the application of convalescent plasma, a small amount of exudative lesions was seen on the chest CT on February 24 (B3). On February 27, after the first application of umbilical cord mesenchymal stem cell therapy, pulmonary exudative lesions improved significantly (B4)